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Full text of "SX-64 Portable Computer Schematics"

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PART NO. - 314001-05 



SX 64 



PORTABLE COMPUTER 



- SCHEMATICS - 



Commodore Business Machines, Inc. 

1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A. 

Commodore makes no expressed or implied war- 
ranties with regard to the information contained 
herein. The information is made available solely on 
an as is basis, and the entire risk as to quality and 
accuracy is with the user. Commodore shall not be 
liable for any consequential or incidental damages 
in connection with the use of the information con- 
tained herein. The listing of any available replace- 
ment part herein does not constitute in any case 
a recommendation, warranty or guaranty as to 
quality or suitability of such replacement part. 
Reproduction or use without expressed permission, 
of editorial or pictorial content, in any matter is 
prohibited. 

This manual contains copyrighted and proprietary information. No part 
of this publication may be reproduced, stored in a retrieval system, or 
transmitted in any form or by any means, electronic, mechanical, 
photocopying, recording or otherwise, without the prior written permis- 
sion of Commodore Electronics Limited. 

Copyright © 1985 by Commodore Electronics Limited. 
All rights reserved. 



CONTENTS 



Title Page 

INTRODUCTION 1 

ASSEMBLY PARTS 1 

BLOCK DIAGRAM 2 

CPU 

PCB LAYOUT 3 

PARTS LIST 4 

SCHEMATIC 6 

FDD 

PCB LAYOUT 7 

PARTS LIST 8 

SCHEMATIC 10 

I/O 

PCB LAYOUT 11 

PARTS LIST 12 

SCHEMATIC 13 

EXPANSION 



PCB LAYOUT 14 

SCHEMATIC 15 

MONITOR 

PCB LAYOUT 16 

PARTS LIST 17 

SCHEMATIC - 01 20 

SCHEMATIC - 01A 21 

P/S 250623 

WIRING DIAGRAM 22 

PARTS INFO 23 

TROUBLESHOOTING 24 

SCHEMATIC 25 



INTRODUCTION 



The SCHEMATICS and PARTS LISTS provided herein are intended for use by QUALIFIED SERVICE 
PERSONNEL. The troubleshooting, theory and diagnostics of the C64, 1702 and 1541 SERVICE 
MANUALS are generally applicable to the SX 64. 

Parts availability from Commodore is limited. Some of the custom chips are used in many devices 
and are in stock. However, parts used in the monitor and power supply may be unique to the OEM 
manufacturer who supplied those assemblies. Only those parts indicated with a "C" are available 
from Commodore. 



ASSEMBLY PARTS 



C 250634-01 


SX 64 


KEYBOARD CABLE 


C 251249-01 


SX 64 


USERS MANUAL 


C 251250-01 


SX 64 


DEMO DISK 


C 251555-01 


SX 64 


KEYBOARD 


C 314095-01 


SX 64 


SINGLE KEY ASSY 


C 325519-03 


SX 64 


ALPS DRIVE ASSY 



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PARTS LIST 

SX 64 CPU 

PCB ASSEMBLY #250408-01 



PLEASE NOTE 

Commodore part numbers are provided for reference only and do not indicate the availability of parts 
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally. 



INTEGRATED CIRCUITS 



UA3 

UA4-UA7 

UB1 

UB2 

UB3 

UB4-UB7 

UC1 

UD1 

UD3 

UD4 

UD7 

UE3 

UE4 

UE7 

UF4 

UF6 

UF7 

UG6 

UG7 



74LS257 

4164 DRAM 200NS 

74LS258 

74LS373 

74LS257 

4164 DRAM 200NS 

74LS139 

2332 ROM CHAR 

2364 ROM Kernal 

2364 ROM Basic 

6510 Microprocessor 

6581 SID 

7700-001 PLA 

2114 RAM 300NS 

6567 VIC 

7408 

7406 

4066 

555 TIMER 



DO NOT USE Tl OR NS 



DO NOT USE Tl OR NS 



C 901225-01 
C 251104-04 
C 901226-01 
C 906107-01 
C 906112-01 
C 906114-01 

C 906109-04 



TRANSISTORS 



TR1-8 



2SC 458 



DIODES 



D1 



Diode, Signal WG 71 3C 



RESISTORS - All Values are in ohms-1/4 W 
5% unless noted otherwise. 



R1 


82 


R2 


150 


R3 


100 


R4 


1.5K 


R5 


3.3K 


R6 


18K 


R7 


8.2K 


R8 


IK 


R9 


IK 


RIO, 11, 


10K 


12 




R13 


IK 


R14 


270 


R15 


100 


R16 


27K 


R17 


20K 


R18 


820 


R19 


2K 


R20 


510 



RESISTORS (Continued) 



R21 

R22 

R23 

R24 

R25 

R31, 32, 

33 

R34 

R35 

R36 

R37 



270 

IK 

1M 

47K 

330 

3.3K 

150 
IK 
120 
200 



RESISTOR PACKS 



RA1, 2 

RA3 

RA4 



33 8Pin 
3.3K lOPin 
3.3K 8Pin 



CAPACITORS 



CI, 2 

C3 

C4-7 

C8 

C9,10 

C11 

C12-14 

CI 5-1 7 

CI 8-20 

C21 

C22 

C23 

C24 

C25 

C26 

C27 

C28 

C29 

C30 

C31, 32 

C33 

C34 

C35 

C36 

C37 

C38 

C39 

C40-46 

C47 

C48 



Ceramic 

Elect 

Ceramic 

Ceramic 

Ceramic 

Ceramic 

Ceramic 

Elect 

Ceramic 

Elect 

Ceramic 

Elect 

Ceramic 

Ceramic 

Elect 

Ceramic 

Ceramic 

Ceramic 

Elect 

Ceramic 

Ceramic 

Ceramic 

Ceramic 

Elect 

Ceramic 

Ceramic 

Elect 

Ceramic 

Elect 

Ceramic 



0.22;tF, 

10/tF, 

0.22,tF, 

0.47/tF, 

0.22^F, 

0.47^F, 

O.I/tF, 

lO^F, 

O.VF, 

10/tF, 

O-VF, 

10,iF, 

470pF, 

0.47^F, 

10/*F, 

0.22^F, 

0.47/tF, 

O.VF, 

lO^F, 

2200pF, 

0.22fiF, 

270pF, 

0.47ftF, 

10/iF, 

O.OVF, 

1 50pF, 

10,iF, 

O.I/iF, 

10/iF, 

O.VF, 



25V 
25V 
25V 
50V 
25V 
50V 
25V 
25V 
25V 
25V 
25V 
25V 
50V 
50V 
25V 
25V 
50V 
25V 
25V 
50V 
50V 
50V 
50V 
25V 
25V 
50V 
25V 
25V 
25V 
25V 



PARTS LIST PCB ASSEMBLY #250408-01 (Continued) 



C - Indicates Commodore Stocked Part Number 



CAPACITORS (Continued) 


MISCELLANEOUS 


C49 


Ceramic 1 0OOpF, 


25V 


FB1-14 


Ferrite bead 


C50 


Ceramic 470pF, 


50V 






C51 


Ceramic 33pF, 


50V 


LI 


Coil Inductor 2.2/iH 


C52 


Ceramic 0.047;tF, 


25V 


L2 


Coil Inductor 22/tH 


C53, 54 


Ceramic 1 800pF, 


50V 






C55 


Ceramic 0.1 /iF, 


25V 


Y1 


Clock Osc 14.31818 MHz 251105-01 


C101 


Ceramic 82pF 








C102 


Ceramic 68pF 








Clio 


Ceramic 1 50pF, 


50V 






cm, 12 


Ceramic 330pF 








C113 


Ceramic lOOpF 








C114 


Ceramic 68pF 









SX 64 CPU 
SCHEMATIC DIAGRAM 



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PARTS LIST 

SX 64 DISK CONTROL PCB 

RGB ASSEMBLY #250410-01 

PLEASE NOTE: 

Commodore part numbers are provided for reference only and do not indicate the availability of parts 
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally. 



INTEGRATED CIRCUITS 


RESISTORS (Continued) 

— All are carbon 1/4 watt, 5% unles 










s noted 


UA1 


TMM2016P RAM 












UA3 


ROM $EOOO-$FFFF 


C 901229-05 


R7, 8 


470 






UA4 


ROM $COOO-$DFFF 


C 325302-01 


R9 


2.2K 






UB2 


74LS04 




RIO 


150 1/4W, 


1% 




UBC3 


6522 VIA 


C 901437-01 


R11 


100 1/4W, 


1% 




UBC4 


6502A CPU 


C 901435-02 


R12 


2.2K 






UC2 


74LS00 




R13 


470 






UD2 


74LS42 




R14 


2.2K 






UD3 


74LS86 




R15, 16 


22K 






UDC5 


6522 VIA 


C 901437-01 


R17, 18 


9. IK 1/4W 


1% 




UE2 


74LS14 




R19, 20 


220 






UE3 


7406 




R21, 22 


150 






UF2 


M54532P TRANS ARRAY 
ULN2064 TRANS ARRAY 


MITSUBISHI SUB: 


R23 
R24, 25 


330 
2.2K 






UF3 


7404 




R26, 27 


470 






UF5 


GATE ARRAY 


C 325572-01 


R28 


360 






UG4 


7407 




R29 


510 






UG5 


74LS193 




R30 


22K 






UH1 


592 VIDEO AMP 




R31 


360 






UH4 


9602 ONE SHOT 




R32 


5.1K 






UH5 


74LS197 




R33 


220 






UJ1 


592 VIDEO AMP 




R34 


330 






UJ4 


74LS86 




R35 


IK 






UK4 


LM311 COMPARATOR 




R36 

R37, 38 
R39 


330 
150 
100K 












TRANSIS 


TORS 




R40-43 

R44 

R45 


IK 

10K 

100 






TR1 


2SC 945 


SUB:2SC 1815 


TR2-5 


2SA 733 


SUB;2SA 1015 


R46-49 


IK 






TR6 


2SA 673 




R50 


47 






TR7 


2SC 945 


SUB:2SC 1815 










CAPACITG 


IRS 












DIODES 














CI, 2 


Ceramic 


■ hf. 


25V 








D1-6 


Signal, 1N4148 




C3 


Electrolytic 


3.3/iF, 


16V 


D7 


Zener, 5.1V, 500m W, +1-5% HZ5C-2 | 


C4 


Ceramic 


■ l/iF, 


25V 


D8 


Signal, 1N4148 




C5 


Ceramic 


680pF, 


50V 


D9 


Zener, 3.3V, 500mW, +1-5% 


HZ3C-2 


C6, 7 


Tantalium 


0.47/tF, 


16V 


D10 


Signal, 1N414B 




C8 


Ceramic 


■ VF, 


25V 








C9 


Ceramic 


lOOOpF, 


25V 








RESISTO 


RS - All are carbon 1 /4 watt. 




CIO, 11 


Ceramic 


.022mF, 


25V 




5% unless noted 




C12 
C13 


Ceramic 
Ceramic 


330pF, 
■ VF, 


50V 
25V 








R1 


680 




C14 


Ceramic 


680pF, 


50V 


R2 


22K 




C15 


Ceramic 


330pF, 


50V 


R3 


91 1/4W, 1% 




C16 


Ceramic 


680pF, 


50V 


R4 


1.5K 




C17 


Ceramic 


33pF, 


50V 


R5 


470 




C18 


Electrolytic 


lO^F, 


25V 


R6 


680 




C19-21 


Ceramic 


■ VF, 


25V 



PARTS LIST SX 64 CPU PCB ASSEMBLY #250410-01 (Continued) 



C - Indicates Commodore Stociced Part Number 



CAPACITORS (Continued) 


MISCELLANEOUS - PCB ASSY #1540048 


C22-30 
C31 

C32, 33 
C34-41 
C50 


Ceramic 

Electrolytic 

Electrolytic 

Ceramic 

Ceramic 


• VF, 
lOO/tF, 

10,tF, 

• VF, 
lOOOpF, 


25V 
16V 
25V 
25V 
25V 


FB1-10 

L1-3 
L4, 5 
L6 

Y1 


Ferrite Bead 

Coil Inductor 100/iH 
Coil Inductor 22/iH 
Coil Inductor 2.2|tH 

Crystal Module 1 6 MHz 50ppm (NDK, Tyocom) 

325566-01 Sub: 
Crystal Module 16 MHz lOOppm (NDK, Tyocom, 
Kyocera) 325566-02 



9 



SX 64 FDD 
SCHEMATIC DIAGRAM 



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PARTS LIST 

SX 64 I/O 

PCBASSEMBLY #2 50409-0 1 

PLEASE NOTE: 

Commodore part numbers are provided for reference only and do not indicate the availability of parts 
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally. 



INTEGRATED CIRCUITS 


RESISTOR PACK 


UCl 
UB2, 3 
UD2 
UE2 
UE3 


4066 

6526 CIA C 906108-02 

7406 

74LS74A 

556 


RA1 


IK BPin 


CAPACITORS 


C1-5 
C6 
C7 

C8-11 
C12, 13 


Ceramic O.^F, 25V 
Ceramic 0.47^F, 50V 
Ceramic 330pF, 50V 
Ceramic 0.1 /iF, 25 V 
Elect 10/iF, 25V 


TRANSISTORS 


TR1 


2SC 945 


RESISTORS - All Values are in ohms-1/4 W 
5% unless noted otherwise. 


MISCELLANEOUS 


FBI -6 

LI 

UAl 


Ferrite Bead 

Coil Inductor 2.2/iH 

Crystal Module 60Hz 


R1 

R3 

R4 

R5, 6, 7 

R8 

RIO 

R11 


220 

3.3K 

47K 

IK 

100K 

3.3K 

47K 



12 



SX 64 I/O 
SCHEMATIC DIAGRAM 




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SX 64 MONITOR ASSEMBLY 
PARTS LIST 



PLEASE NOTE: 

Commodore part numbers are provided for reference only and do not indicate the availability of parts 
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally. 



CHASSIS PARTS 



vol 


*CRT, 




*CRT Socket, 


DY1 


*Def. Yoke, 


T502 


*F.B. Transf. 


Q907 


Transistor, 


Q503 


Transistor, 


R523 


* Focus Pack, 


C001 


*Ceramic Cap, 



150BMB22-AF 

C39158-D 

C29131-VA (See note below) 

CJ39587-00A 

2SD1118 

2SC2335 

CJ4951 0-257 

lOOOpF, 3KV, +100%, -0% 



NOTE: 

IF DEFLECTION YOKE CJ26235-00A IS USED, 
THE FOLLOWING PARTS VALUES CHANGE: 



DEF and POWER REG PCB 1124 A-1 



CAPACITORS 



C515, 517 
C519, 520 



'Polypropylene, 5600pF,630V, +5% 

'Elect 4.7/iF,160V, +30%, -10% 



VIDEO and AUDIO PCB 1124 A-2 



CAPACITORS 



C201 
C206 
C522 



Elect, 

Bi-Polar Elect, 
Mylar, 



1000/iF,25V, ±20% 

4,7/^F,50V, +20% 

.VF,50V, ±20% 



SAFETY COMPONENTS - Use EXACT replacement ONLY. 



17 



DEF and POWER REG PCB 1123 A-1 


CAPACITORS 


INTEGRATED CIRCUITS 


C401, 404 

C408 

C409, 410 

C412 

C413 

C509 

C515,16, 

17 

C518 

C520 

C523, 24 

C525 

C901 

C904, 905 

C907 

C913, 914 


Bi-Polar Elect, l/iF, 50V, +20% 
Tantalium, VF, 25V, ±10% 
Tantalium, lliJF, 10V, +10% 
Elect, lOOO^F, 25V, +20% 
Elect, 0.22/iF, 50V, ±20% 
Polypropylene, 5600pF, 50V, ±5% 

* Polypropylene, 4700pF, 630V, ±5% 

Mtl Mylar, 1.5|iF, lOOV, +5% 

* Polypropylene, 0.047,tF, 200V, +10% 
*Elect, 470/iF, 16V, +30%, -10% 
Elect, 4,7,iF, 160V, +30%, -10% 

* Elect, lOO^F, 35V, +30%, -10% 
*Elect, 470^F, 35V, +30%, -10% 
Bi-Polar Elect, 10/iF, 25V, ±20% 

* Elect, 2200/iF, 16V, +30%, -10% 


IC401 
IC501 


Vert.,^PC1031H2 
Hor., AN5750 


TRANSISTORS 


Q401 

Q501 

Q502 

Q902 

Q903,4,5 

Q906 

Q907 


2SA1015 (Y, GR) 

2SC1685 

2SA817A (0,Y) 

2SA1015 (Y, GR) 

2SC1685 

2SA817A(0,Y) 

2SD111B 


DIODES 


TRANSFORMERS 


D501 

D502 

D504,5, 

6,7 

D902 

D903 

D904 

D905 

D906 

D907 

D908, 9 


Zener RD6.8E (B2) 

V19E 

V09E 

U19B 

*Zener RD6.8E (B2I 

Zener Hz 12 (B) 

*Zener RD6.8E (B2) 

1S2473H 

*Zener RD13E (B1) 

1S2473H 


T901 
T501 
T502 
T531 


Pwr Drive, A76567-MA 
Hor Drive, A76568-MA 
*F.B., CJ39587-00A 
*Side Pin, C39084-A 


MISCELLANEOUS 


F03 


*Fuse, 2A, 125V 


VIDEO and AUDIO PCB ASSY 1123 A-2 


RESISTORS 


INTEGRATED CIRCUITS 


R901 
R910 
R917 
R923 
R924 
R925 
R926 


*Carbon, 8.2K, 1/4W, ±5% 

* Carbon, 9. IK, 1/4W, ±5% 
Oxide Mtl Film, 1.5K, 1W, +5% 
*Carbon, 27K, 1/4W, ±5% 
'Carbon, 10K, 1/4W, +5% 

* Carbon, 68K, 1/4W, ±5% 
Mtl Film, 0.22, 2W, ±10% 


IC201 
IC601 


Audio, HA11401 
Video, AN5250 


TRANSISTORS 


Q201 
Q601 


2SA562TM (Y) 
2SD1133 


VARIABLE RESISTORS 


DIODES 


R409 
R413 
R417 
R508 
R909 


V. Hght, 22K 
V. Lin, 2.2K 
V. Center, IK 
Hor. Hold, 2.2K 
*81 Adj., 2K 


D601 
D503 


Zener, RD10E (B3) 
1S2076A 



* SAFETY COMPONENTS - Use EXACT replacement ONLY. 



18 



VIDEO and AUDIO 

PCB ASSY 1123 A-2 (Continued) 


CHROMA PCB ASSY 1123 A-3 


INTEGRATED CIRCUITS 


VARIABLE RESISTOR 


IC301 


HA11247 


R220 


Sub Com, 2K 


TRANSISTORS 


CAPACITORS 


Q701,2,3 


2SC2610 


C201 
C202 
C203 
C204 
C206 
C208 
C210 
C604 
C608 
C522 


Elect, 

Bi-Polar Elect, 
Elect, 
Tantalium, 
Bi-Polar Elect, 
Tantalium, 
Tantalium, 
Bi-Polar Elect, 
Elect, 
Bi-Polar Elect, 


2200/tF, 

10/tF, 

3.3/tF, 

0.47fiF, 

3.3/iF, 

33/iF, 

VF, 

VF, 

lOOO^F, 

0.47/iF, 


16V, 
16V, 
25V, 
35V, 
50V, 
16V, 
25V, 
50V, 
25V, 
50V, 


+ 30%, -10% 

+ 20% 

+ 30%, -10% 

+ 20% 

+ 20% 

+ 10% 

±20% 

+ 20% 

±20% 

+ 20% 


RESISTORS 


R710,11, 
12 


Oxide MtlFilm, 12K, 1W 


±5% 


VARIABLE RESISTORS 


R702 
R705 
R706 
R708 
R709 


B. Cut-Off, 10K 
R. Cut-Off, 10K 
R. Drive, 500 
G. Cut-Off, 10K 
G. Drive, 500 


MISCELLANEOUS 


FR526 

L504 

L601 


* Fusible Resistor, 
Peaking Coil 
Peaking Coil 


10, 1/4W, 
^00|lH 
4.7^H 


±5% 




CAPACITORS 


C303 
C304 
C306 
C310 
C315 


Elect, 100|uF, 

Elect, 0.47^F, 

Elect, 4.7^F, 

Trimmer 

Elect, 33fiF, 


16V, +20% 
50V, +20% 
50V, +20% 

16V, ±20% 


MISCELLANEOUS 


X301 


Crystal A75746 



* SAFETY COMPONENTS - Use EXACT replacement ONLY. 



19 



SX 64 MONITOR 
SCHEMATIC -01 




20 



SX 64 MONITOR 
SCHEMATIC -01A 




21 



POWER SUPPLY #250623 
WIRING DIAGRAM 




PART 
MO 




I/EWDOR 
MO 


VtWDOR'S 


POLl 


WO 


NAME 
OT- 5I6WH 


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b 




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1 


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BLK 


1 




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MOLfX 


2 


1 


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BLU 






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Acqr 


BLU 


8 




^zil-oh 


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6 


1 


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Ol?<T 


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Err 


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4 


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a 




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6 


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UL IOpT 


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5 


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6 


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Ti,fr 


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22 



PARTS INFORMATION 



1, RECl S3WB^0 



RECTIFIER STACKS DKJIIES 



'O' 




2, REC2 



3. D1 



i, D6^7 



5, QT 



6. Q3 



S1VB10 



RECTTFIER. STACKS FIOlDES 




ERB2A-06C 




FAST RECaVERY^DIODES 




T 



ESAC85-009 , ESAC 8-2-00/1 SCHOTTKY BARRIER DIODES- 

rc a s e- 



( ca s e j 



2SC2625 

(case) 




JLEDEC:T0-22i}AB 



<t 




POWER TRANSISTOR 
( case ) 



< 



2aG2334 ^ <^ POWEE TRANSISTOR 
Tease) r^**=^ QTcasej 




JEDEC :T0-220AB 



23 



TROUBLESHOOTING GUIDE 



TROUBLE 



CHECK POINT 



CAUSES AND TEST 



SOLUTION 



NO OUTPUT- 



-SOME SCRAP INSIDS- 

!oK 



NO AC 9^^ 
OUTPUT ■■ 



-SUPPLEMENTARY CIRCUIT- 
OK 



IN CASE OPl 
REC1 SHORl! CHECK BRIDGH DIODE- 
FUSE IS cdT OK 



IN CASE OF 
Q1 SHORT 
FUSE IS cutr 



5V output 
ONLY NO - 
OUTPUT 



-CHECK SWITCHING 

TRANSISTOR 

OK 



CHECK HIGH-SPEED 
RECTIFY DIODE 
OK 



12V CONTROL 
CIRCUIT 



-CHECK SWITCHING 
TRANSISTOR 

OK 



CHECK DRIVE 
TRANSISTOR 

iOK 



CHECK HIGH-SPEED 
RECTIFY DIODE 
lOK 



5V CONTROL 
CIRCUIT 



-SHORT CIRCUIT BIY SCRAP- 



YES 



YES 



-T2 TRANSFORMER SHORT OR OPEN- 

T2 PRIMARY LEAD WHITE TO WHITE l60~200/i. 
SECONDARY LEAD RED TO RED 9-12 jt. 

SECONDARY LEAD BLUE TO BLUE 3.2'v3.7rL 

[OK 



REC2 S1VB-10 DIODE 
RECTIFIED VOLTAGE DC 12'v15V 

REC1 S3WB40 SHORT OR OPEN ^^^ 




Q1 2SC2625 SHORT OR OPEN' 
C 



YES 



D6 ESAC85-009 SHORT OR OPEN- 



YES 




A K A 

CHECK BETWEEN COLLECTOR AND EMITTER NO 



I OF 2SG2625 IN Q1 BY SYNCHR.0 -SCOPE 

J_ 



no~35ov" 



A 



|YES 

12V OUTPUT ADJUSTMENT SHIFT- 



YES 



YES 



Q3 2SC233i SHORT OR OPEN- 

Q4. 23A1020-0orY SHORT OR OPEN- 



YES 



"S, 



D7 ESAC82-00i SHORT OR OPEN- 



YES 



CHEC BETWEEN EMITTER OF 2SC233^ AND NO 
GRUND IN Q4. BY SYNCHRO^SGOPE i 

L 

IZTT 



^ 



YES 

5V OUTPUT ADJUSTMENT SHIFT- 



YES 



-CLEANING 



-i CHANGE T2 



-CHANGE REC1 



-CHANGE Q1 



-CHANGE D6 



CHANGE A BOARD 
"of 12V CONTROL 



-RE-ALIGNMENT 



-CHANGE Q3 



-CHANGE Q4. 



-CHANGE D7 



-CHANGE A BOARD 
OF 5V CONTROL 



H — RE-ALIGNMENT 



24 



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csi^TcsisTcsiTT 



C:C5!2 >R5!4 
.0022? 330 
MY I I/2W 



■ ft commodore 

^^ Computer Systems Division , ^ 

__" 1200 Wilson Drive 



West Chester, PA 1 9380 

-OR OU i 

Bl 28V 



^502